The frequency domain performance of high speed DACs hastraditionally been characterized by analyzing the spectral outputof a reconstructed full-scale (i.e., 0 dBFS), single-tone sine waveat a particular output frequency and update rate. Although thischaracterization data is useful, it is often insufficient to reflect aDAC’s performance for a reconstructed multitone or spreadspectrumwaveform. In fact, evaluating a DAC’s spectralperformance using a full-scale, single tone at the highest specifiedfrequency (i.e., fH) of a bandlimited waveform is typicallyindicative of a DAC’s “worst-case” performance for that givenwaveform. In the time domain, this full-scale sine wave representsthe lowest peak-to-rms ratio or crest factor (i.e., VPEAK/Vrms) that this bandlimited signal will encounter.
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